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Journal of Dairy Science Vol. 78 No. 4 804-815
© 1995 by American Dairy Science Association ®
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The Effect of Feed Intake and Growth Hormone-Releasing Factor on Lactating Dairy Cows

H. Lapierre 1, G. Pelletier 1, T. Abribat 2, K. Fournier 2, P. Gaudreau 2, P. Brazeau 2, and D. Petitclerc 1

1 Agriculture Canada, Lennoxville, QC, Canada J1M 1Z3
2 Neuroendocrinology Laboratory, Notre-Dame Hospital, Montréal, QC, Canada H2L 4M1

Twenty-four lactating dairy cows, averaging 30.0 kg/d of milk and 159 d of lactation, were used to study the effect of feed intake and growth hormone-releasing factor in a 2 x 2 factorial arrangement. For the first 10-d period, cows had free access to a TMR and received a fixed amount of high moisture corn, protein supplement, and hay. In the second 10-d period, 12 cows were maintained on this high intake, and 12 cows received 70% of their previous intake (low intake). During the following 10-d period, each intake group was divided, and each of two subgroups (n = 6) received twice daily s.c. injections of saline or growth hormone-releasing factor (10 µg/kg of BW per injection). Feed restriction decreased milk production by 24%. Milk production increase was not different following growth hormone-releasing factor treatment for cows maintained at high intake (4.6 kg/d) or low intake (3.4 kg/d). Feed restriction increased concentration of growth hormone but did not affect IGF-I concentration. Growth hormone-releasing factor increased IGF-I concentration similarly for both intake groups but increased concentrations of insulin and IGF-binding proteins-1 and -3 only in the high intake group. Low intake did not affect growth hormone, IGF-I, or milk responses to growth hormone-releasing factor, but suppressed the increase in concentrations of insulin and IGF-binding proteins-1 and -3 following treatment with growth hormone-releasing factor for cows on high intake.

Key Words: growth hormone-releasing factor • intake • insulin-like growth factor-I • binding proteins

Submitted on April 28, 1994
Accepted on December 2, 1994




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D. B. Carlson, N. B. Litherland, H. M. Dann, J. C. Woodworth, and J. K. Drackley
Metabolic Effects of Abomasal L-Carnitine Infusion and Feed Restriction in Lactating Holstein Cows
J Dairy Sci, December 1, 2006; 89(12): 4819 - 4834.
[Abstract] [Full Text] [PDF]


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Copyright © 1995 by the American Dairy Science Association ®.